Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham thuc » nham thuc, pham thuc, tham thuc
hang dai » hoang dai, hang tai, hang dau
va hang » van hang, va nang, va lang
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
sach v » sach va, sach y, sach vay
sach 2 » sach y

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach v) OR (sach 2)) ((nang xa) OR (nang x)) hoi. hieu ve cham thuc va hang dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) OR (sach 2)) ((nang xa) or (nang x)) hoi. hieu ve cham thuc va hang dai cua triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach 2)) ((nang xa) or (nang x)) hoi. hieu ve cham thuc va hang dai cua triet*.